Three-phase DC motor

Abstract

A three-phase DC motor includes a rotor having plurality of magnetic poles, and a stator. The stator has three corners. The second corner is adjacent to a first direction of the first corner. The third corner is adjacent to a second direction of the first corner. The first corner, the second corner, and the third corner extend forwards to the rotor to form a first winding slot, a second winding slot, and a third winding slot respectively. A first winding, a second winding, and a third winding respectively wind around the first winding slot, the second winding slot, and the third winding slot. The mechanical angle between the first winding slot and the second winding slot is between 75 and 85 degrees. The mechanical angle between the first winding slot and the third winding slot is also between 75 and 85 degrees.

1 . A three-phase DC motor, comprising:
 a rotor with a magnet having a plurality of magnetic poles; and   a stator having a first winding slot, a second winding slot, and a third winding slot, wherein the second winding slot is adjacent to a first direction of the first winding slot, the third winding slot is adjacent to a second direction of the first winding slot, wherein a first winding, a second winding, and a third winding respectively wind around the first winding slot, the second winding slot, and the third winding slot, the mechanical angle between the first winding slot and the second winding slot is between 75 and 85 degrees, and the mechanical angle between the first winding slot and the third winding slot is also between 75 and 85 degrees.   
   
   
       2 . The three-phase DC motor as claimed in  claim 1 , wherein the magnet on the rotor has six magnetic poles magnetized in the radial direction. 
   
   
       3 . The three-phase DC motor as claimed in  claim 1 , wherein the magnet on the rotor has twelve magnetic poles magnetized in the radial direction. 
   
   
       4 . The three-phase DC motor as claimed in  claim 1 , wherein there is an air-gap between the said winding slots and the said rotor. 
   
   
       5 . The three-phase DC motor as claimed in  claim 1 , wherein a brush on the said stator is hereby used for changing the driving phases of the current on the said winding coils when the three-phase DC motor is operating. 
   
   
       6 . The three-phase DC motor as claimed in  claim 1 , wherein a sensor and a phase-changing circuit are hereby used to instead of the said brush for changing the driving phases of the current on the said winding coils when the three-phase DC motor is operating. 
   
   
       7 . The three-phase DC motor as claimed in  claim 1 , wherein a sensorless phase-changing circuit is hereby used to instead of the said brush for changing the driving phases of the current on the said winding coils when the three-phase DC motor is operating. 
   
   
       8 . The three-phase DC motor as claimed in  claim 1 , wherein a 120 driving degree 6-step driving method with square driving waveform is used for changing the driving phases of the current on the said winding coils when the three-phase DC motor is operating. 
   
   
       9 . The three-phase DC motor as claimed in  claim 1 , wherein a timing method is used for forming gradually soft-switching effect in driving status switch when the three-phase DC motor is operating. 
   
   
       10 . The three-phase DC motor as claimed in  claim 1 , wherein the said sensor signals are amplified for forming gradually soft-switching effect in driving status switch when the three-phase DC motor is operating. 
   
   
       11 . The three-phase DC motor as claimed in  claim 1 , wherein a 180 driving degree driving method with square driving waveform is used for changing the driving phases of the current on the said winding coils when the three-phase DC motor is operating. 
   
   
       12 . The three-phase DC motor as claimed in  claim 1 , wherein a 180 driving degree driving method with sinusoidal driving waveform is used for changing the driving phases of the current on the said winding coils when the three-phase DC motor is operating. 
   
   
       13 . The three-phase DC motor as claimed in  claim 1 , wherein a 180 driving degree driving method with trapezoid driving waveform is used for changing the driving phases of the current on the said winding coils when the three-phase DC motor is operating. 
   
   
       14 . The three-phase DC motor as claimed in  claim 1 , wherein a 150 driving degree  12  step driving method with square driving waveform is used for changing the driving phases of the current on the said winding coils when the three-phase DC motor is operating. 
   
   
       15 . The three-phase DC motor as claimed in  claim 1 , wherein a timing method is used for forming gradually soft-starting effect in starting the three-phase DC motor. 
   
   
       16 . The three-phase DC motor as claimed in  claim 1 , wherein a PWM signal is used for controlling a rotating speed of the three-phase DC motor when the three-phase DC motor is operating. 
   
   
       17 . The three-phase DC motor as claimed in  claim 1 , wherein a linear signal for controlling the magnitude of the said driving current is used for controlling a rotating speed of the three-phase DC motor when the three-phase DC motor is operating.